This article explains how to download and install Firefox on Windows using a simplified online installer. (Advanced users: see the For advanced users section at the end of the article.)
- To update Firefox from a previous version, see Update Firefox to the latest release.
Before installing Firefox, see the Firefox System Requirements to make sure that your computer has the required operating system and recommended hardware.
Do not install Firefox using a limited Windows XP account. For more information, see Microsoft's support article How to determine your user account type in Windows.
- Visit this Firefox download page in any browser, such as Microsoft Internet Explorer or Microsoft Edge.
- Click the
button. The Firefox Installer that downloads will automatically offer you the best available version of Firefox for your computer.
- If you use Microsoft Edge or Internet Explorer, a notification bar will appear at the bottom of the page with an option to open or run the Firefox installer file. Click Open file or to start the process.
- In other browsers, you may need to first save the Firefox installer to your computer, then open the file you downloaded.
Note: If you see an Open File - Security Warning dialog, click or .
- The User Account Control dialog may open, to ask you to allow the Firefox Installer to make changes to your computer. If this dialog appears, click
- Wait for Firefox to finish installing.
Note: The Firefox Installer may contain an Update or Re-install button and an option to restore default settings and remove add-ons, if a very outdated Firefox version or very old profile data is detected. Clear the checkbox to keep the old data and click or to start the installation.
- When the installation is complete, Firefox will open.
Here are some articles that can help you:
- Firefox won't start - find solutions
- "Firefox is already running but is not responding" error - How to fix
- If you see the message, Firefox cannot be installed. This version of Firefox requires a processor with SSE2 support. see Your hardware is no longer supported.
For advanced users
The streamlined Firefox Installer installs a suitable Firefox version for your language and operating system. For example, on 64-bit Windows, it installs the 64-bit version of Firefox (details here). To install Firefox in another language or operating system, or if you need a full, offline installer with custom options, download the Firefox Setup file from this download page. Options available in the full, offline installer are described in the article, Custom installation of Firefox on Windows.